ISDN Cause Codes

ISDN Cause Codes

ISDN Cause codes for the router form ITU-T Q.850
The following are standard ISDN cause codes

Cause Code	Code Definition
1	Unallocated number
3	No route to destination
6	Channel unacceptable
7	Call awarded and being delivered in an established channel
16	Normal call clearing
17	User busy
18	No user responding
21	Call rejected
22	Number changed
26	Non-selected user clearing
27	Destination out of order
28	Invalid number format
29	Facility rejected
30	Response to a status enquiry
31	Normal, unspecified
34	No channel available
38	Network out of order
41	Temporary failure
42	Switching equipment congestion
43	Access information discarded
44	Request channel not available
47	Resource not available
49	Quality of service unavailable
50	Requested facility not subscribed
57	Bearer capability not authorized
58	Bearer capability not presently available
63	Service or option not available
65	Bearer capability not implemented
66	Channel type not implemented
69	Request facility not implemented
70	Only restricted digital information bearer capability is available
79	Service or option not implemented, unspecified
81	Invalid call reference value
82	Identified channel does not exist
83	Suspended call exists, but call identity does not
84	Call identity in use
85	No call suspended
86	Call with the specified call identity is cleared
88	Incompatible destination
91	Invalid transit network selection
95	Invalid message, unspecified
96	Mandatory information element is missing
97	Message type non-existent or not implemented
98	Message not compatible with call state or message type non-existent or not implemented
99	Information element non-existent or not implemented
100	Invalid information element contents
101	Message not compatible with call state
102	Recovery on timer expiry
111	Protocol error, unspecified
127	Internetworking, unspecified